Fig. 1.

Variation in morphological characteristics and photosynthetic rate (mean ± s.d.) in plants sampled from invasive New Zealand populations of Egeria densa, Elodea canadensis and Lagarosiphon major, before and after cultivation in common garden conditions. Number of groups before and after transplantation is given by X/Y in each diagram. Letters indicate significant difference between populations before (lowercase letters) and after (uppercase letters) common garden. d. wt, dry weight; PS, photosynthetic rate.